Hello, i was working with real functions in real coefficients. I was
doing some test to be sure it was all always real (without imaginary
part), and i ask Sage to solve this:
var('x',domain=RR);
solve([imag(x)==0,imag(sqrt(-x^2-1))==0],x);
and it answered me:
[[x == -I], [x == I]]
I would understand if he can solve it (find a real solution is
difficult), but i expected an error more than an incorrect answer.
Thanks
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